That little pop up flash on your camera is only good for one thing, triggering your other flashes via slave sync. No other reason.

Off camera flash is a way to completely change your photos. Just by moving the flash around you can have lots of different photos from the same settings on your camera

Take the flash off your camera and set it to the side of your subject, you will create a completely different look. You can add a second off camera flash to balance out the shadows. Adding a soft box or octobox to your flashes will help with shadows as well.

With this image, I had two flashes set in up in the car with a red gel attached to one.